Restauranteurs Derek and Lucas Gamlin are on a tear. The brothers have made their Sub Zero Vodka Bar in the Central West End the go-to spot for vodka aficionados, but the Gamlins are just getting started. They chat about how they are shaking up the dining scene with two new restaurants, one slated to open in September, and even helping thirsty Rams and Blues fans find refreshing Sub Zero vodka drinks at games this season.